This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 32 |
| 6 | 65 |
| 7 | 134 |
| 8 | 280 |
| 9 | 598 |
| 10 | 1300 |
| 11 | 2884 |
| 12 | 6516 |
| 13 | 15008 |
| 14 | 35147 |
| 15 | 83680 |
| 16 | 202139 |
| 17 | 494982 |
| 18 | 1226753 |
| 19 | 3074146 |
| 20 | 7779561 |
| 21 | 19863702 |
| 22 | 51125018 |
| 23 | 132541616 |
| 24 | 345867101 |
| 25 | 907922596 |
| 26 | 2396276355 |
| 27 | 6355845398 |
| 28 | 16934718359 |
| 29 | 45309972502 |
| 30 | 121697068925 |
| 31 | 328029259192 |